I want to know which structure is right when forming past perfect tense?
"She was very sad because she hadn't got the package."
"She was very sad because she hadn't gotten the package."
As far as I know, including Had + past participle is a must when forming past perfect tense. So basically the "She had gotten" must be the right choice but my English guide book suggests the "She had got" is right and I asked from a few of friends and they said that the "She had got" is ok and normal in British English. I don't which one should I go with and it is so important for me to know the difference since I deal with academic lessons and writings.